Flames are the heat and light energy that is release when the chemical bonds in a substance are broken. What provides the chemical potential energy in a candle?

A. spark

B. heat

C. wax

D. water

How is a lithium atom (Li) different from a lithium ion (Li+)

The term used to describe the Doppler shift in wavelength of light emitted by a star moving away from the Earth is: A. Longitudinal shift B. Transverse shift C. Redshift D. Blueshift

An explosion that destroys the outer portion of a star is known as a

Which statement describes a reversible reaction at equilibrium? (1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.

Sea salt is formed by natural evaporation of ocean water and contains 98% sodium chloride. The remaining 2% are natural minerals such as iron and sulfur. Consider a 84.7-g sample of sea salt.

The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/L. Water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/L.

The smallest unit of an element is a blank

How many sodium atoms will create an ionic bond with sulfur?

Rank the elements from smallest to largest electronegativity negativity (smallest at top) 1. N 2. P 3. As 4. Sb

A bicyclist pedaling up a Hill. What type of energy potential or kinetic?